Antiseptic organic-silver compound.



' UNITED STATES;

MARTIN DODSWORTH, OF DETROIT, MICHIGAN, ASSIGNOR TO NELSON;

BAKER & 00., OF

DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN;

No. 900,835. Specification o! ANTISEI PTIC ORGANIC-SILVER COMPOUND.

Letters Patent. Patented Oct. 13, 1908.

Application filed April 4, 1908. Serial No 425,179. (Specimens.)

' To all 'uihom it mag concern:

Be it known that I, MARTIN Dooswon rn, a subject of the Kin -of Great Britain and I relaud, residing at fietroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Antiseptic Organic-Silver Compounds, of which the following is a. specification, reference being had therein to the accompanying drawings. The invention relates generally to antiseptic compounds, andconsists in a new substance of this character having powerffil antiseptic and germicidal properties, but differing materially from similar known compounds of this class, in being practically a non-irritant, the s bstancc being particularly useful for the treatment of affections of the eye, as traehoma, and suppuration of the inner car. It is derived from a soluble salt of silver, preferably the nitrate, ammonia and. formaldehyde in the proportions and amounts as hereinafter set forth, and is expressed in its preferred-form by the symbol:

canumuopii It may be prepared by adding to'one volume of a 40% solution of formaldehyde two volumes of a 10% solution of ammonia. This mixture is then allowed to stand an hour or two to permit the chemical union to be elfccted, and is subsequently evaporated to, expel any excess of anunonia. The soluble silver salt,prefcrably the nitrate,is then gradually added as long as a precipitate is produced.

The reaction which takes place is as follows:

and'dricd in Mano in a place from which actinic rays of light are excluded.

The compound .is soluble in 500 parts of water at 25 0., and is insoluble in alcohol, chloroform and ether. At 192 C. it darkens, and at approximately 197 C. it decomposes, giving off a gas with a disagreeable, herringbrine odor. Heated with diluted sulfuric acid, it is decomposed with the liberation of formaldehyde. \Vhen heated at a white heat in a porcelain crucible, silver is left behind, which can be identified by the usual tests. If 0.1 gm. of the compound be mixed with 0.1 gm. of salicylic acid and 5 cc. of sulfuric acid, and then heated moderately, a Carminered color should be produced. i

- The percentage composition of the compound is as follows: carbon, 2318 per cent.; oxygen, 15.48 per cent; hydrogen, 3.89 per cent; nitrogen, 22.63 per cent.; and silver, 34.82 per cent.

What I claim as my invention is,

wa-tcr. and insoluble in alcohol, chloroform and ether, and decomposes when heated to 197 C.

In testimony whereof I afiix my signature in presence of two witnesses.

MARTIN DODSWORTH W i tnesscs N an): a Kmsunm, JA MES l. BARRY.

1. An antiseptic organic silver compound,

irritant action,,,is lustrous White in color, substantially odorless, sparingly soluble in 

